Throttling mechanism



May 20 1924.

E. J. BARNTT THROTTLING MECHANISM Filed March 22. 1923 2 Sheena-sheer lIII',

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May zo, 1924. 1,495,064v

E. J. BARNETT THRTTLING MECHANISM Filed March 22,1925 2 sheets-snoer 2Patented May 20, 1924.

' UNITED STATES EDWARD J. BARNETT, C F-CHICAGO, I-LLIATOIS. i*

i THnoTTLmGMEcnAN'Isi/rf, l V

.Application 'alec Maranza 'lelzlp'L-Sfs'er'iiai Non; 216,735.7' i.

To all whom t may conce/m.' l

' Be it known that I, EDWARD J. BARNE'r-r, citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvementin Throttling Mechanism, ofwhich the"following is a full, clear, concise, and exact description.

My invention relates to throttling mechanism and is of particularutility when adapted to locomotives, thoughpthe invention: is not'to belimitedito its usev in connectio'n'with engines nor tothe control ofanyparticular fluid. The throttling mechanism of a locomotive includes abalanced valve located in thesteam chamber and in thepiping thatdistributes the steam to the engine cylinders. The mechanism foroperating the valveinicludes an actuating'rod connectedwith thebalan'cedvalve uponthe interior of the steam chamber and projecting tothe exterior of the steam chamber through astufing box, there being athrottle lever upon the exteriorof the chamber that is assembled withthe exterior end ofthe rod whereby the balanced valve may be adjusted.'Thethrottle lever carries a holding dog that is engageable with anarcuate rack-for the purpose of holding the lever and valve controlledthereby any selected adjustment, this holding dogr being adjustable withrespect to the 'lever and with respect to the arcuaterack to vbring andout of action.l

' y The balanced valves are apt to open gradually if the holding dogsfailjtov function, due to the unopposed outward thrusting pressure whichis exerted upon the rods 'by the ysteam within the steam chambers."

In carrying out my invention I cause opposing pressure upon-said rodtobeexertedfby the steam within'the' steamY 'chamber and to this end thethrottle lever is continued beyondits fulcrum into connection with an'-other rod that projects throughA another stuffing box into the steanrychamber and which presents a surface that receives outward thrustingpressure `of the steam within the chamber, this surface being of a sizeto secureA the desired opposing pressure, this pressure preferably beingequal to the pressure exerted upon the actuating rod of the balancedvalve. l 1 f i The fulcrum for the throttle lever being between the tworods, it is obvious that the pressure of the steam within theisteamchamber .will exert outward pressure upon both rods. to cause opposingturningpmoinerits upon. the throttlefflev'er ,that are of 4selected'degrees'4 determinefdfby the end j surfacesA upon the -rodsex'posedft'o.v the steam withinrfthe -steamcha'mberfard 'thedi'stancesbetween the rods andthe fulcrum of the throttleflever. Thedesi'red'results yare thus accomplished without the'addition ofanyloadupon the throttleflever, .'Chfloacl' upon this leverIbeinrg'onthe"contrary,"reduced. l

' he invention' 'will' be more `fully',l` ex"- YplainedVv by" referencelto the accompanying Se'GOhal view ofa portion. off a locomotive' boiler'having the throttle mechanism' of nay. invention; Fig. '2`is 'a front'view of; the

Structure shown in Fig.f1`; Fig. Swis a plan view; .andjFigll is a. viewon line 'of the piping .being 'equipped withvalve seats @for a balancedvalve'll thatisjin Avalxfint'gf relation to the port dened byv thisseat.This'balancedvalve has afstem 5 terminating in aj'yoke v6 ,that embracesthe" bar`7. VThe witha rod 9 that freely passes throu'ghjche lowerendsiof't-he and through oneend of: each of? the bell crank. leversl0.;V These bell crankflevers''arepivoted at 'their elbows uponthebrackets l-l ,formed upon thepiping 2. rodflZ is linkedwiththeotheren'dof one "o'fl the bell crank levers ,and".'.passes throughastuliing f box ,'13 supported by a mounting 14.-V universallyseated'nwithinfthe opening 15in the-*front wall'th'rough" which the rod1.2passes, as is'well known by 'those familiar with`lthe..art., The endvof lthe rod 12 that isupon the exterior .of thevfcasing hasthe usualflexible connection I6 withthe crumed upon the post or other Vsupport 18that is' carried by the aforesaid mountingl-i. f

f A'holding dog"19.is 'slidably mounted upon' the throttle llever` to be.movable 'lon/gig;-- tudinally thereof "by the y'leverV 2O` assembledat, one end 'with the holding dogana assem: y

exterior end connected with said lever, the

tween said rods, the portions of the rods within the chamber havingsurfaces upon which the fluid Within the chamber exerts opposingoutwardly thrusting pressures.

5. The combination with a chamber for containing fluid under pressure,there being a port through which fluid may be conveyed from the chamber;of a valve for said port; a rod having operating connection with thevalve within the chamber and extending through the chamber to theexterior thereof;

a throttle lever connected with the outer end a port through which fluidmay be conveyedA from the chamber; of a valve for said port; a rodhaving operating connection with the valve within the chamber andextending through the chamber to the exterior thereof; a throttle leverconnected with the outer end of said rod; a support upon which saidlever is fulcrumed; and a second rod also extending into said chamberand having an exterior end connected with said lever, the fulcrum of thelever being between and substantially equidistant from said rods, the

portions of the rods within the chamber having surfaces upon which thefluid within the chamber exerts opposing outwardly thrusting pressures,the inner portions of said rods presenting surfaces to the fluid. Withinthe fluid chamber which will cause the fluid to exert substantiallyYequal outwardly thrusting pressures upon said rods.`

7. The combination with a chamber for containing fluid under pressure,there being a port through which fluid maybe conveyed from the chamber;of a balanced valve for said port; mechanism having operating connectionwith the valve within the chamber and extending to the exterior ofthechamber; and an element having a portion Within the chamber upon lwhichthe fluid may exert outward thrusting pressure, this element beingcoupled with the aforesaid mechanism to oppose the outward thrustingpressure exerted upon said mechanism bythe Huid.

8. The Ycombination with a` chamber for containing fluid under pressure,there being a port through which fluid may be conveyed from the chamber;of a valve for said port; mechanismV having` .operating connection withthe valve within the chamber and extending to the exterior of thechamber; and an element having a portion within the chamber upon whichthe fluid may exert outward thrusting pressure, this element beingcoupled with the aforesaid mechanism to oppose the outward thrustingpressure exerted upon said mechanism by the fluid.

In witness whereof, I hereunto subscribe my name this 12th day ofMarchfA. D.,

EDWARD J. BARNETT.

